Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae72eb637641c4ea…

MALICIOUS

PDF

72.9 KB Created: 2021-02-27 22:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0c1b83cb1418237279545ba98576d49f SHA-1: c4e931c927d6040daf56a3da9c5babe493b016ba SHA-256: ae72eb637641c4eaafbfef2d29d01b7191e46df7b98758eb39042d0afe75dbe7
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/award?keyword=are+walmart+bikes+good PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379474/normal_601d59f2a526f.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jf11xzp/friendship_circle_virtual_run.pdfIn PDF document text
    • http://italysummer.fun/defender_90_soft_top_kitycygm.pdfIn PDF document text
    • http://trelon.fun/gazivekedifipetozuprtv0g.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/sIhbDt7/cake_recipe_chocolate_raspberry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5ff765c362bc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402519/normal_5fdd65f427cfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420905/normal_5ff6770b57c12.pdfIn PDF document text
    • http://maximizator.space/jajiresemqcfje.pdfIn PDF document text
    • http://podeves.xyz/75174947986bwyh3.pdfIn PDF document text
    • http://grinallex.shop/cambridge_advanced_learners_dictionaryfc1mc.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/ehcgdgi/glow_grid_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/Mhjhjjo/mevijuvelud.pdfIn PDF document text
    • http://antinomi.design/jisodamaxumm1xqz.pdfIn PDF document text
    • http://clubstore.info/fudaxeratonuwuxkzzis.pdfIn PDF document text
    • http://fb-ig-violation.com/pujajelosuzelel1sib.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/iblR8ie/air_hockey_glow_2_player_ipad.pdfIn PDF document text
    • http://polikarmonolit.ru/hp_laserjet_p2015_error_lights_meaning5e366.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/29502330904.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/9411860094.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/pejoredebijusisupe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 5432 bytes
SHA-256: f0d77ed38b875c3cd299dbaf74fd434a2c712a7884815c4408331ed76b10a9ef
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10476 bytes
SHA-256: 195eb30975460e293886daca64d0dd92dac5e6e2d0fd4ff564e76da888f78773

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